Related Clues:

• Create chasms
• Disappear slowly
• Fall off, as support
• Cause to deteriorate
• Diminish, as support
• Cavity cause
• Go from rock to dust
• Destroy bit by bit
• Take the edge off?
• Succumb to wind and water
• Slowly wear away, as a cliff face
• Under-mine
• Vanish over time
• Decrease, as support
• Eat away at the bank?